scholarly journals Responses of the phytoplankton functional structure to the spatial and temporal heterogeneity in a large subtropical shallow lake

2018 ◽  
Vol 30 (0) ◽  
Author(s):  
Luciane Oliveira Crossetti ◽  
Lacina Maria Freitas-Teixeira ◽  
Juliana Elisa Bohnenberger ◽  
Uwe Horst Schulz ◽  
Lúcia Ribeiro Rodrigues ◽  
...  
Keyword(s):  
Functional Groups ◽  
Functional Traits ◽  
Shallow Lake ◽  
Linear Dimension ◽  
Spatial Organization ◽  
Life Forms ◽  
Functional Structure ◽  
Spatial And Temporal Variation ◽  
Temporal Heterogeneity ◽  
Spatial And Temporal Heterogeneity

Abstract Aim Studies on biological communities that take into account only the species composition and abundances (or biomass) and their relative contributions, most of the time, do not reflect their ecological functions, especially considering the wide spatial and temporal variation of large shallow lakes. This paper aimed at evaluating the influence of environmental spatial and temporal heterogeneity on the functional structure of phytoplankton in a subtropical large shallow lake. Methods Seasonal samplings were carried out in 2010 and 2011, in 19 sampling sites distributed along the entire length (90 km) and width (3-10 km) of Lake Mangueira, a large (820 km2 ) and shallow lake (zmean = 2.6 m), comprising the littoral and pelagic zones of the north, central and southern regions. Abiotic variables and phytoplankton functional traits (volume, maximum linear dimension, life forms) and functional groups were analyzed as measures of functional structure. Results The results showed that there was no spatial organization of phytoplankton functional traits during the study. Colonial non-flagellated organisms, organisms with cellular volume between 103 and 104 μm3 and greater than 104 μm3, and with maximum linear dimension between 21 and 50 μm prevailed in all zones and regions. Phytoplankton functional groups and traits responded to resource variation, especially increasing their variety and contribution during spring and summer periods. Conclusions The functional structure of the phytoplankton community in Lake Mangueira, here accessed by functional traits and RFGs, was more conditioned by its environmental temporal variability rather than by the spatial variation, indicating that the resources and life conditions seasonal variation strongly influence the phytoplankton in this ecosystem.

Sustainable harvest regimes for magpie geese (Anseranas semipalmata) under spatial and temporal heterogeneity

2005 ◽  
Vol 32 (5) ◽  
pp. 459 ◽  
Author(s):  
Barry W. Brook ◽  
Peter J. Whitehead
Keyword(s):  
Population Decline ◽  
Model Systems ◽  
Management Systems ◽  
Spatial And Temporal Variation ◽  
Temporal Heterogeneity ◽  
Quota System ◽  
Spatial And Temporal Heterogeneity ◽  
Management Regimes ◽  
Future Viability ◽  
Harvest Strategy

We developed a population model of magpie geese in the Northern Territory that considered spatial and temporal variation and related sources of uncertainty, building on previous analyses of the plausible rates of increase for this species. The model was used to explore realistic limits to recreational and indigenous harvest and to examine productive, yet risk-averse, management regimes for long-term sustainability. Harvest strategies based on a proportional off-take provided similar yields to a fixed quota system, but resulted in a reduced risk of substantial population decline. Moreover, higher harvests could be supported in model systems that incorporated dispersal phenomena consistent with patterns suggested by the observed distributional and abundance patterns. However, irrespective of harvest strategy and spatial structure, off-take at the levels implied in previously published analyses are clearly unsustainable. These results illustrate the desirability of matching the design of management systems to the heterogeneity of population processes. Management regimes that fail to take account of spatial and temporal heterogeneity could damage the interests of important stakeholder groups and potentially imperil the future viability of the species. However, the costs of disaggregated management systems may be substantial and benefits of investment in them need to be clearly demonstrated. Gaining better appreciation of spatial variation in harvests should be given high priority.

Identification of Freshwater Zooplankton Functional Groups Based on the Functional Traits of Species

2021 ◽  
Vol 48 (10) ◽  
pp. 1849-1856
Author(s):  
D. E. Gavrilko ◽  
G. V. Shurganova ◽  
I. A. Kudrin ◽  
B. N. Yakimov
Keyword(s):  
Functional Groups ◽  
Functional Traits ◽  
Freshwater Zooplankton

scholarly journals The role of terrestrial bromeliads in determining the spatial organization of plant life forms in a tropical coastal forest

2017 ◽  
Vol 31 (1) ◽  
pp. 84-92
Author(s):  
Celio M. Lopes ◽  
Flora Misaki ◽  
Karina Santos ◽  
Carlos A. P. Evangelista ◽  
Tatiana T. Carrijo ◽  
...  
Keyword(s):  
Spatial Organization ◽  
Life Forms ◽  
Coastal Forest ◽  
Plant Life Forms ◽  
Plant Life

Biomass distribution of fishes and mussels mediates spatial and temporal heterogeneity in nutrient cycling in streams

Oecologia ◽  
2018 ◽  
Vol 188 (4) ◽  
pp. 1133-1144 ◽  
Author(s):  
Garrett W. Hopper ◽  
Keith B. Gido ◽  
Caryn C. Vaughn ◽  
Thomas B. Parr ◽  
Traci G. Popejoy ◽  
...  
Keyword(s):  
Nutrient Cycling ◽  
Temporal Heterogeneity ◽  
Biomass Distribution ◽  
Spatial And Temporal Heterogeneity

scholarly journals Effects of Life-form and Plants Functional Traits on Carbon, Nitrogen and Sulfur Distributed in Different Parts in Dry Region of Western India

2021 ◽  
Author(s):  
Genda Singh ◽  
Bilas Singh
Keyword(s):  
Functional Traits ◽  
Life Form ◽  
Life Forms ◽  
Climatic Conditions ◽  
Western India ◽  
High Concentration ◽  
N Content ◽  
Medicinal Uses ◽  
Leguminous Species ◽  
C And N

Abstract Background: Plants adapt to adverse environmental conditions accumulate varying concentrations of carbon (C), nitrogen (N) and sulfur (S) compounds to cope up with adverse climatic conditions. Carbon, N and S concentrations were determined in roots, stem and leaves of 33 species of trees/shrubs with objectives to observe the effects of life-form and plants functional traits, and select species with high concentration of these elements for their utilization in afforestation and medicinal uses. Results: Concentrations of C, N, and S and C: N and N: S ratio varied (P<0.05) between species, organs, life-forms and functional traits (legume vs non-legume). These variables were higher (except C in roots and stem) in trees than shrubs, and in leguminous than non-leguminous species. Non-leguminous species showed high S content and low N: S ratio. Antagonistic and synergistic relations were observed between C and N, and N and S concentration respectively. Species showed varying potential in assimilating carbon by regulating uptake and accumulation of these elements in different organs making them adapt to the habitats affected by drought and salinity. We observed strong plant size/life-form effects on C and N content and C: N and N: S ratios and of function on S content. Conclusions: Life-form/size and varying functions of the species determined C: nutrient ratio and elemental composition and helped adapting varying environmental stresses. This study assist in selecting species of high carbon, nitrogen and S content to utilize them in afforesting the areas affected by water and salt stresses, increased carbon storage and species with high S/N content in medicinal uses.

Sign in / Sign up

Export Citation Format

Share Document